A multi-cylinder synchronous testing press

Abstract

The utility model provides a kind of multi-cylinder synchronous test press, including multiple groups of oil cylinder, control valve group, oil cylinder mounting plate, movable platen, disc spring load mechanism and support steel pipe, multiple groups of oil cylinder are equipped with same control valve group, the cylinder body of multiple groups of oil cylinder is all installed with displacement sensor;The lower portion of oil cylinder mounting plate is equipped with movable platen, movable platen is driven by the piston rod of oil cylinder, movable platen lower portion is equipped with disc spring load mechanism, and oil cylinder mounting plate, movable platen and disc spring load mechanism are connected by support steel pipe;Disc spring load mechanism includes disc spring connecting plate and disc spring guide pillar, disc spring group is sleeved on disc spring guide pillar, disc spring guide pillar is arranged between movable platen and disc spring connecting plate, disc spring guide pillar upper end is connected with movable platen lower surface, and disc spring connecting plate is equipped with the through-hole for disc spring guide pillar to pass through.The utility model can realize the accurate adjustment of different load levels, and solve the problems of insufficient load coverage, low precision and poor efficiency of traditional debugging mode.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic machinery technology, and in particular to a multi-cylinder synchronous testing press. Background Technology

[0002] The core working principle of a multi-cylinder synchronous press is to achieve precise synchronization of pressure and displacement through power source drive, synchronous control module adjustment, and coordinated action of multiple cylinders, ultimately completing pressing, forming, and other processes. Under synchronous control, the multiple cylinders extend or retract synchronously, driving the upper crossbeam to move smoothly: during pressing / forming, the upper crossbeam descends at a uniform speed, and the multiple cylinders apply balanced pressure synchronously, avoiding deformation of the workpiece due to uneven force or displacement deviation; after the process is completed, the control system issues a return command, and the multiple cylinders synchronously reset, waiting for the next cycle.

[0003] Multi-cylinder synchronous presses, with their advantages of high rigidity, uniform pressure, and ample omnidirectional operating space, are widely used in industrial applications such as automotive sheet metal forming, aerospace composite material bonding, metal forging, concrete block molding, and rubber and plastic mold pressing, undertaking core processes such as high-precision pressing, forming, and assembly. The synchronous control accuracy of these machines directly determines the workpiece forming quality and assembly reliability. Pre-shipment performance calibration and operational condition adaptability verification are crucial for ensuring stability in on-site use.

[0004] The current factory commissioning methods for multi-cylinder synchronous presses have significant drawbacks: traditional commissioning relies heavily on "no-load test runs + single-load simulation," which involves calibrating synchronization accuracy through cylinder movements under no-load conditions and then simulating a single load scenario using fixed weights or simple tooling. This approach can only verify equipment performance under limited operating conditions. However, in practical applications, multi-cylinder synchronous presses need to adapt to diverse load conditions. For example, in automotive frame pressing, the number of welds and the thickness of sheet metal vary between different car models, leading to significant load fluctuations. In composite material bonding processes in the aerospace field, load accuracy requirements are even higher; even minor load changes can cause uneven adhesive layer thickness. Traditional commissioning methods cannot cover these complex load scenarios, resulting in synchronization deviations exceeding tolerances during field use after the equipment leaves the factory due to insufficient load adaptability. This necessitates multiple on-site adjustments by technicians, increasing after-sales costs and delaying production line commissioning.

[0005] In existing technologies, some companies have attempted to use hydraulic loading devices to simulate loads for factory commissioning, but this approach has significant limitations: hydraulic loading systems are complex, requiring independent hydraulic pump sets, pressure regulating valve sets, and control systems, increasing commissioning costs; pressure fluctuations are large during loading, making it impossible to accurately reproduce the steady-state load of actual working conditions; furthermore, adjusting loading parameters is cumbersome, requiring disassembly of the tooling when changing load scenarios, and single-condition commissioning is time-consuming, making it difficult to meet the factory testing requirements of large-scale production. The market's demands for the efficiency and accuracy of factory commissioning of multi-cylinder synchronous presses continue to increase, and the industry urgently needs a load simulation testing device that is "low-cost, high-precision, and quickly adaptable." Utility Model Content

[0006] The purpose of this invention is to provide a multi-cylinder synchronous testing press, which solves the problems existing in the prior art.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A multi-cylinder synchronous testing press includes multiple sets of hydraulic cylinders, a control valve assembly, a cylinder mounting plate, a movable pressure plate, a disc spring load mechanism, and a supporting steel pipe. The multiple sets of hydraulic cylinders are mounted on the cylinder mounting plate, and each set is equipped with the same control valve assembly for controlling the extension and retraction of the cylinders. Displacement sensors are installed inside the cylinder bodies of each set of cylinders to detect the displacement of the cylinder piston rods. A movable pressure plate is located below the cylinder mounting plate, driven by the piston rods of the cylinders. A disc spring load mechanism is located below the movable pressure plate. The cylinder mounting plate, the movable pressure plate, and the disc spring load mechanism are connected by the supporting steel pipe.

[0008] Furthermore, the disc spring load mechanism includes a disc spring connecting plate and a disc spring guide post. A disc spring assembly is sleeved on the disc spring guide post. The disc spring guide post is located between the movable pressure plate and the disc spring connecting plate. The upper end of the disc spring guide post is connected to the lower surface of the movable pressure plate. The disc spring connecting plate is provided with a through hole for the disc spring guide post to pass through.

[0009] Furthermore, the number of disc spring guide posts and hydraulic cylinders is the same.

[0010] Furthermore, the disc spring guide post includes four posts, which are located at the four corners of the lower surface of the movable pressure plate. The hydraulic cylinder includes four sets, and the positions of the hydraulic cylinder and the disc spring guide post correspond to the upper and lower surfaces of the movable pressure plate.

[0011] Furthermore, several support steel pipes are provided, which pass through the cylinder mounting plate and the disc spring connecting plate, and the two ends of the support steel pipes are fixed with nuts.

[0012] Furthermore, a supporting steel pipe is also provided between the cylinder mounting plate, the movable pressure plate, and the disc spring connecting plate.

[0013] Furthermore, the displacement sensor is a magnetostrictive displacement sensor.

[0014] Furthermore, the control valve assembly controls the movement of multiple hydraulic cylinders. The control valve assembly includes a proportional directional valve, pressure sensors, an electromagnetically controlled bidirectional hydraulic lock, and a balance valve. The rodless chamber of each cylinder has a working port A, and the rod chamber has a working port B. The proportional directional valve is connected in sequence to the cylinder's port B, via the balance valve and the electromagnetically controlled bidirectional hydraulic lock. The proportional directional valve regulates the cylinder's flow rate and direction of movement, the balance valve balances the load during cylinder descent, and the electromagnetically controlled bidirectional hydraulic lock maintains pressure and locks the cylinder position. Both the working ports A and B of the cylinder are equipped with pressure sensors to monitor the cylinder chamber pressure. When the proportional directional valve is in the left position, pressurized oil enters the rodless chamber through port A, and oil returns from port B in the rod chamber, causing the piston rod to extend. When the proportional directional valve is in the right position, pressurized oil enters the rod chamber through port B, and oil returns from port A in the rodless chamber, causing the piston rod to retract.

[0015] Furthermore, the balance valve consists of an overflow valve and a check valve, and the electromagnetically controlled bidirectional hydraulic lock consists of two hydraulically controlled check valves and an electromagnetic directional valve.

[0016] The beneficial effects of this utility model are as follows: This utility model is a multi-cylinder synchronous test press with disc springs as the core load simulation element. By combining and stacking disc springs, it can achieve precise adjustment of different load levels. The number and position of the cylinders can be flexibly adjusted according to the needs. It has the advantage of simulating multiple working conditions and enables rapid and accurate verification of multiple working conditions at the factory stage, solving the problems of insufficient load coverage, low accuracy and poor efficiency of traditional debugging modes.

[0017] This invention relates to a multi-cylinder synchronous testing press with high synchronization accuracy: precise synchronous control of the cylinders via a control valve group effectively solves the synchronization deviation problems caused by oil compressibility, pipeline pressure loss, and load differences. This invention uses precise signal feedback and dynamic adjustment to offset the inherent differences between cylinders, achieving synchronized operation across multiple cylinders. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0019] Figure 2 This is a schematic diagram of the hydraulic control principle of this utility model.

[0020] Figure 3 This is a schematic diagram illustrating the connection principle between the control valve assembly and the hydraulic cylinder of this utility model.

[0021] In the diagram: 1: Hydraulic cylinder, 11: Displacement sensor, 2: Control valve group, 21: Proportional directional valve, 22: Pressure sensor, 23: Electromagnetically controlled bidirectional hydraulic lock, 24: Balance valve, 3: Hydraulic cylinder mounting plate, 4: Movable pressure plate, 5: Disc spring connecting plate, 6: Disc spring guide post, 7: Support steel pipe. Detailed Implementation

[0022] like Figure 1 As shown, a multi-cylinder synchronous testing press includes four sets of hydraulic cylinders 1, a control valve group 2, a hydraulic cylinder mounting plate 3, a movable pressure plate 4, a disc spring load mechanism, and a support steel pipe 7. The hydraulic cylinders 1 are mounted on the hydraulic cylinder mounting plate 3. All four sets of hydraulic cylinders 1 are equipped with the same control valve group 2 for controlling the extension and retraction of the hydraulic cylinders 1. Displacement sensors 11 are installed inside the cylinder bodies of all four sets of hydraulic cylinders 1. The displacement sensors 11 are magnetostrictive displacement sensors used to accurately detect the displacement of the hydraulic cylinder piston rod. A movable pressure plate 4 is located below the hydraulic cylinder mounting plate 3, driven by the piston rod of the hydraulic cylinder 1. A disc spring load mechanism is located below the movable pressure plate 4, including a disc spring connecting plate 5 and a disc spring guide post 6. A disc spring guide post 6 is sleeved on the disc spring guide post 6. The device includes a disc spring assembly. Disc spring guide posts 6 are positioned between the movable pressure plate 4 and the disc spring connecting plate 5. There are four disc spring guide posts 6. The upper end of each disc spring guide post 6 is connected to the lower surface of the movable pressure plate 4. The four disc spring guide posts 6 are respectively positioned at the four corners of the lower surface of the movable pressure plate 4. The positions of the hydraulic cylinder 1 and the disc spring guide posts 6 correspond to the upper and lower surfaces of the movable pressure plate 4. The disc spring connecting plate 5 has through holes for the disc spring guide posts 6 to pass through. The upper and lower ends of the disc spring assembly are in contact with the lower surface of the movable pressure plate 4 and the upper surface of the disc spring connecting plate 5, respectively. When the hydraulic cylinder 1 drives the movable pressure plate 4 to press down, the disc spring assembly simulates a load and is compressed to store energy. When the hydraulic cylinder releases pressure, the disc spring assembly releases its elastic potential energy, pushing the movable pressure plate to return quickly and smoothly. The cylinder mounting plate 3, the movable pressure plate 4, and the disc spring load mechanism are connected by a support steel pipe 7. Several support steel pipes 7 are provided, which pass through the cylinder mounting plate 3 and the disc spring connecting plate 5. The two ends of the support steel pipe 7 are fixed by nuts. There is also a support steel pipe 7 in the middle of the cylinder mounting plate 3, the movable pressure plate 4, and the disc spring connecting plate 5. The support steel pipe 7 ensures the overall rigidity of the press.

[0023] like Figure 2-3As shown, a multi-cylinder synchronous testing press principle includes four identical control valve groups 2. These control valve groups 2 control the movement of four sets of hydraulic cylinders 1 within the multi-cylinder synchronous testing press. Each control valve group 2 includes a proportional directional valve 21, a pressure sensor 22, an electromagnetically controlled bidirectional hydraulic lock 23, and a balance valve 24. The proportional directional valve 21 employs electro-hydraulic proportional control to adjust the flow rate and direction of movement of the hydraulic cylinder 1, thereby regulating the cylinder's action. It features multi-stage flow control and precise directional control. The rodless chamber of the hydraulic cylinder 1 has a working port A, and the rod chamber has a working port B. The balance valve 24 and the electromagnetically controlled bidirectional hydraulic lock 23 are sequentially connected between the proportional directional valve 21 and port B of the hydraulic cylinder 1. The balance valve 24 consists of an overflow valve and a check valve, used for load balancing during cylinder descent. The electromagnetically controlled bidirectional hydraulic lock 23 consists of two hydraulically controlled check valves and an electromagnetic directional valve. When energized, the electromagnetically controlled bidirectional hydraulic lock 23... When energized, the hydraulic lock unlocks, allowing bidirectional flow of oil; when de-energized, the hydraulic lock locks, preventing the cylinder from moving under load, thus maintaining pressure and locking the position. Pressure sensors 22 are installed at both the working oil ports A and B of cylinder 1, which can convert pressure signals into continuous electrical signals for real-time monitoring and feedback of cylinder chamber pressure.

[0024] like Figure 2 As shown, this utility model includes four identical sets of hydraulic cylinders 1 and control valve groups 2. The four sets of control valve groups 2 are connected in parallel to the power system and the oil tank. The power system includes a dual hydraulic pump, which is driven by an electric motor and includes a large pump and a small pump, providing dual pressure / flow output to the system to adapt to different load requirements. Pressure gauges and electromagnetically controlled relief valves are connected sequentially to the outlets of the large pump and the small pump for graded control of system pressure. One-way valves are connected sequentially between the dual hydraulic pump and the proportional directional valve 21 of the control valve group 2. The system includes a valve, a return oil filter with a signal transmitter, and a check valve, allowing unidirectional oil flow. A return oil filter with a signal transmitter, a plate heat exchanger, and a check valve are connected between the oil tank and the return oil circuit of control valve group 2. The return oil filter with the signal transmitter filters impurities in the return oil. The signal transmitter sends a signal when the filter element is contaminated, prompting for filter element replacement. The plate heat exchanger is used to cool the hydraulic oil, maintaining a stable system oil temperature and preventing oil performance degradation due to excessively high oil temperature. The oil tank is also equipped with an air filter, a level gauge, and a level / temperature gauge with temperature indication.

[0025] When this invention is used, for simulated press molding tests, the large pump of the dual hydraulic pump provides power oil, the proportional directional valve 21 of the control valve group 2 is in the left position, the pressure oil enters the rodless chamber of cylinder 1 through port A, and the oil returns through port B of the rod chamber of cylinder 1, causing the piston rod of cylinder 1 to extend. The high-precision magnetostrictive displacement sensor 11 installed on the cylinder body and the pressure sensor 22 installed on the working port of cylinder 1 can monitor and collect the actual displacement and pressure data of each cylinder in real time. Then, the proportional directional valve 21 is used to adjust and dynamically distribute the oil flow, correct deviations, and ensure that the actions of the four sets of cylinders are consistent. At this time, the movable pressure plate 4 is driven by the piston rods of the four sets of cylinders 1 to press down smoothly. The disc spring group simulates the load, and the number of disc spring groups can be flexibly adjusted according to the test requirements to change the load of the disc spring group. Different load levels can be accurately adjusted by combining and superimposing different numbers of disc spring groups. During the movement, the disc spring guide post 6 provides guidance for the movable pressure plate 4, and the disc spring connecting plate 5 plays a buffering and vibration reduction role to ensure that the movable pressure plate 4... The movement is smooth and the force is even during the pressing and forming process.

[0026] After the process is completed, when the piston rod of cylinder 1 needs to retract, the small pump of the double hydraulic pump provides power oil, the proportional directional valve 21 of the control valve group 2 is in the right position, the pressure oil enters the rod chamber of cylinder 1 through port B, and the oil returns through port A of the rodless chamber, and the piston rod of cylinder 1 retracts; the four cylinders are synchronously reset, waiting for the next cycle. After the piston rod of cylinder 1 retracts, the disc spring group sleeved on the disc spring guide post 6 releases elastic potential energy, pushing the movable pressure plate 4 to return quickly and smoothly.

Claims

1. A multi-cylinder synchronous testing press, characterized in that: The system includes multiple sets of hydraulic cylinders (1), control valve groups (2), hydraulic cylinder mounting plates (3), movable pressure plates (4), disc spring load mechanisms, and support steel pipes (7). The multiple sets of hydraulic cylinders (1) are mounted on the hydraulic cylinder mounting plates (3). Each set of hydraulic cylinders (1) is equipped with the same control valve group (2) for controlling the extension and retraction of the hydraulic cylinders (1). Displacement sensors (11) are installed in the cylinder bodies of each set of hydraulic cylinders (1) for detecting the displacement of the hydraulic cylinder piston rod. A movable pressure plate (4) is provided below the hydraulic cylinder mounting plates (3). The movable pressure plate (4) is driven by the piston rod of the hydraulic cylinders (1). A disc spring load mechanism is provided below the movable pressure plate (4). The hydraulic cylinder mounting plates (3), movable pressure plates (4), and disc spring load mechanisms are connected by support steel pipes (7).

2. The multi-cylinder synchronous testing press according to claim 1, characterized in that: The disc spring load mechanism includes a disc spring connecting plate (5) and a disc spring guide post (6). A disc spring assembly is sleeved on the disc spring guide post (6). The disc spring guide post (6) is located between the movable pressure plate (4) and the disc spring connecting plate (5). The upper end of the disc spring guide post (6) is connected to the lower surface of the movable pressure plate (4). The disc spring connecting plate (5) has a through hole for the disc spring guide post (6) to pass through.

3. The multi-cylinder synchronous testing press according to claim 2, characterized in that: The number of disc spring guide posts (6) and the number of oil cylinders (1) are the same.

4. A multi-cylinder synchronous testing press according to claim 3, characterized in that: The disc spring guide post (6) includes four posts, which are located at the four corners of the lower surface of the movable pressure plate (4). The oil cylinder (1) includes four sets.

5. A multi-cylinder synchronous testing press according to claim 2, characterized in that: The supporting steel pipe (7) has several sections that pass through the cylinder mounting plate (3) and the disc spring connecting plate (5). Both ends of the supporting steel pipe (7) are fixed by nuts.

6. A multi-cylinder synchronous testing press according to claim 2, characterized in that: A supporting steel pipe (7) is also provided between the cylinder mounting plate (3), the movable pressure plate (4) and the disc spring connecting plate (5).

7. A multi-cylinder synchronous testing press according to claim 1, characterized in that: The displacement sensor (11) is a magnetostrictive displacement sensor.

8. A multi-cylinder synchronous testing press according to claim 1, characterized in that: The control valve group (2) controls the movement of multiple sets of hydraulic cylinders (1). The control valve group (2) includes a proportional directional valve (21), a pressure sensor (22), an electromagnetically controlled bidirectional hydraulic lock (23), and a balance valve (24). The rodless chamber of the hydraulic cylinder (1) is provided with a working oil port A, and the rod chamber is provided with a working oil port B. The proportional directional valve (21) and the hydraulic cylinder (1) are connected in sequence to the balance valve (24) and the electromagnetically controlled bidirectional hydraulic lock (23). The proportional directional valve (21) The balance valve (24) is used to adjust the flow rate and direction of movement of the oil cylinder. The balance valve (24) is used to balance the load when the oil cylinder descends. The electromagnetically controlled bidirectional hydraulic lock (23) is used to maintain pressure and lock the position of the oil cylinder. The working oil ports A and B of the oil cylinder (1) are equipped with pressure sensors (22). The pressure sensors (22) are used to monitor the pressure in the oil cylinder chamber. When the proportional directional valve (21) is in the left position, the pressure oil enters the rodless chamber of the oil cylinder (1) through port A, and the oil returns through port B of the rod chamber of the oil cylinder (1). The piston rod of the oil cylinder (1) extends. When the proportional directional valve (21) is in the right position, the pressure oil enters the rod chamber of the cylinder (1) through port B, and the oil returns through port A of the rodless chamber, causing the piston rod of the cylinder (1) to retract.

9. A multi-cylinder synchronous testing press according to claim 8, characterized in that: The balance valve (24) consists of an overflow valve and a check valve, and the electromagnetically controlled bidirectional hydraulic lock (23) consists of two hydraulically controlled check valves and an electromagnetic directional valve.

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